So the more I dig into it the previous owner of my truck knew nothing about finishing. My 351m and C6 combo he said shifted rough, well turns out that's because the vacuum modulator has no line to it. I'm going to bend out some brake line and make a connection for it, and just use rubber on the ends. Second there is no kickdown on it. I'm looking into a cable type or even a rod if I can find one. In the meantime is this going to cause troubles or can I leave it as is for now? My motor has a Edelbrock 4barrel carb on it, any suggestions as to cable or rod for the hookup?
I'm running my turbo 350 without a kickdown cable and the only thing I notice is it shifts pretty quick. What I mean is the 1-2 shift happens at about 15 mph and the 2-3 shift at about 30. That's at very low throttle, normal driving. If I get on it it will shift at higher mph, I'm not sure if it's the lack of a kickdown or the 3:91 gears. I don't miss the kick down to "p***ing gear", If I want to I'll shift down manually. Maybe someone else can chime in and school us both if I'm right or wrong.
I ran mine with no kickdown. It didn't downshift by itself, but always worked good enough and would shift manually just fine. Lasted a pretty long time despite substantial (I was in my 20s at the time) abuse.
You won't hurt the C6 by running without a kickdown (or a C4 for that matter) if that's what your question was. Just downshift manually.
^^^^^^^ yep, and if its an automatic you just put your foot down until you have to stop. Its va***n operated so it tells the ****** to shift down. I ran mine without one for awhile and then got a new carb that had the kickdown on it. Basically in short, your foot is the kickdown....
[QUOTE="Whitey Ford" 62 Uni;5666935]^^^^^^^ yep, and if its an automatic you just put your foot down until you have to stop. Its va***n operated so it tells the ****** to shift down. I ran mine without one for awhile and then got a new carb that had the kickdown on it. Basically in short, your foot is the kickdown....[/QUOTE] The vacuum modulator only controls upshifts. It tells the trans when to shift up based on engine vacuum. When an engine is under a light load or no load, high vacuum acts on the modulator which moves the throttle valve in one direction to allow the transmission to shift early and soft. As the engine load increases, vacuum is diminished which moves the valve in the other direction causing the transmission to shift later and more firmly. It does not control downshifts under acceleration at all. That is only controlled manually by the shifter or via a shift down cable or linkage connected to the accelerator linkage (at the car usually)
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